Extension ladder



Sept 12, J F MURPHY I EXTENS ION LADDER Filed Aug. 22, 1931 7Sheets-Sheet l INVENTOR fimsfgagg ATTORN EY Sept. 12, 1933.

J. F. MURPHY EXTENSION LADDER Filed Aug. 22, 1931 7 Sheets-Sheet 2INVENTOR 7 I ATTORNEY Sept. 12, 1933- J. F MURPHY 1,926,697

EXTENSION LADDER Filed Aug- 22 1931 7 Sheets-Sheet 3 INVENTOR ATTOR N EYSept. 12, 19-33.

J. F. MURPHY EXTENS I ON LADDER Filed Aug- 22. 1931 7 Sheets-Sheet 4INVEN ATTORNEY Sept. 12, 1933. J. F. MURPHY EXTENSION LADDER Filed Aug.22, 1931 7 Sheets- -Sheet 5 INVENTOR BY amesIiZgg/Z ATTORNEY Sept. 12,1933. Q MURPHY 1,926,697

EXTENS I ON LADDER Filed Aug. 22, 1931 7 Sheets-Sheet 6 INVENTOPATTORNEY Sept. 12, F. HY 1,926,697

EXTENS I ON LADDER Filed Aug. 22. 1931 '7 Sheets-Sheet 7 g //ff)///INVENTOR ATTOR N EY Patented SeptQIZ,

. one-half to Joseph Mich;

Application j: =EXTERNVSIQQNTLADDER' i i zciai 's. "(011 228414)",

' Thisinvention relates to eictension ladder con stru'ctions; andbelongs particularly to that type of ladder comprising a, number ofsections mov able one in or upon the 'otherQ-Withmeans for extendingtheladder sections, andfor 'r aisingthe ladder. This invention isconcerned likewise with ladders of the character stated which are assoIt' is the objectbf this mitt n to produee an extension laddercomprising pertsjof-special construction and combination, and inclu clingfanadjustable cage'at the top whereina; 'workjman} may stand whenemployed in painting a. side wall is believed thatth e" specialconstruction herein. specified results in'en especially convenient,easgoiiy operated and durable structurewhich will withstand continuous fusewithout d ep'reoie,tiong.

or excessivewearl f j A Inthe accompanying drawings-are illustrated thevarious parts of this invention, showingthe constructionandarrangement,thereof. Of--the drawings; Fig. '1 represents ja.plan"view o'rfto'p View showing allparts assembled. v g IjFigg2 is a;side 'view' it: ai fvertical position of; the ladderindi'cetecl inbroken lines.

i Fig. 4 is a yertieal sectionjtaken on the broken Iine '44; of Fig. 2 lking-towards and showing Fig. 5is1a side 'view of oneief thefjac'k's,portions. thereof being broken awaytolglisclose in,-

Email-Jams. i

*Fig. 6 is stop iew of the endof onefl attfie ly mm erslmihes m r -m o atop View Jof one of the jacks ettzichedt'o' theba'r f and, showing thegroun i'plate ofpthe jack;

" Egg. '7 is a, vertical section showing one channel iron side :of thesupporting frame; and one of 15 the means of clamping thebarend frame.

J Fig'.8'is a; side viewoi a; portion of the ladder extended, showingtheflrelative positions ofthe sections, and i the 1 cable, connection,operating drum'and sheaves by which 5i) ladderare-extended. i r

the! sections of} the seetions of the ladder showingthereteht' geer heldin; extended position,

are also provided forrevolvi'ng and. controlling qaiij'oui'id thering tosupport thej'ca ge bottom; v

Rig. 1'! 'ishfside v ewof thejuppersections oj the Q V ladder extended,and:somewhat:en1arged;j;showi gih cas inj Pl e i U p extremity othe'topei tiong. '21} of cagelagider showing 'trejck c abiesthereforfland 5 u h u th d aw r n e semenumber is'used to refer 'to' theome part the sliding "or laterally movable bars thereof ,i with tre,tedeven with the upper surface orfioor of the 5 "turntablefi, j Bearing upothefouter edge of the;

the preferred construction jof thesectionsend the manner of, theirniovablerengagementTonewith another. j Fig. llis aiside View oftheiupperend of the 7 top see-nonfat *the leoider, 'sliowing the, brake 0} wheelwith the brake band thereon, and the brake Y onera ting levjerby whichthe brakewheelis held. J

The brake wheel is 'shown upon one of thetrum' nions or the support hoopof the cage,gwhieh hbfopi V and cage are hfeld inposition'by the brakedeer 5 Figf12' isiotop Viewpf'theicege showing the I "position of theb'iakewheel on thejsupport hoop support hoop, thetrunnionsjend thebrakewheel f of a house, for exemple, orsim flar occupation." It' on one of,the trunnions;

' Fig, 14 s sectional viewsliowing the top hdo'fi; Y

This" view is enlarged.

- 1 zjsig. s is se'ctionelflyiew of "the stench hoop showingonej ofthetrunnions with thebrake wheel ,jattached'theret 'flhis'view; is e lared; I

flFig; Yl8is"alperspectii ejtiew or; modifie ci'forrn i weights 'for"keeping the track -,cables teut.

[Considering the drawings, a supporting frem eoe bfeny chosenjf ormm aybe enigloyed'. Usuallythe? V f frame hasjtheside channelirons 1 and;2;the-end pieces 3,, andthejunct'ions Qffthecross fpieces' and. 2

side pieces are reinforcedby the corner 'plates.

Thefreme also has the: intermediate cross beams 5 best shown inFigQZi,'andfuponfthose beam'stisq, secured a lergegeer 6,'Whi'eh, encircles'eihub 7 9 The hub. Z is hollow vertically and rises as 'iilus turnttble' areirollers 9,,fcarriecl by the brackets :10 r V attached to theframe. Belowthecircula rfid e'of .19 I 5 the turntahle directlybeneethft he rollers Q jar I likelr'ollers 11', and therim'of the:turntable is rejstreiinedto'its cilcularpalth'fas it is revolved As bestshown in'Fig; 3 Ta, shelf 12 ri s e's" rota tively' 1 imp n the tu tablea it new nt 1. e e h 9 and description the,

7 yond the sides 1 and 250i the frame, andto clamp 1 the bars togetherand fl): their positions-when exis rotated trolled. x

of the'large gear6, and a small gear 13 is secured to the lower'end ofthe shaft 12 and in meshwith the gear 6. By means of a hand wheel lonthe top' of the shaft 12, which is extended a convenient distance abovethe turntable, the gear 13 and theturntable revolved and con- In Fig; lare shown the lat erallyfsliding bars or brace angle irons 15. Thosebars. 15 .slide lengthwise side by side in opposite directions beetended there is provided a clamp 16 controlledby abolt 17 which passesthroughan end-piece 3' of the frame as also shown in Fig. 7; At theouter end of each sliding bar 15 is a jack referred to as awholeby thenumber 18. s The individual con- I 'structions of the jacks and theparts for their,

adjustment are. best illustrated in Fi'g.-5. The housing 19 has avertical chamber 20, and a side compartment '21. ,The housings 19 andthe ends of the sliding bars 15 are'rigidly connected. "Within thechamber 20, is-a stout pipe 22 Wan vertical series of teeth 23, A base"member 24 hasa screw threaded .upper'portion 25* engaging internalthreads in the lower "portion of thepipe orjcylinder'22. Throughthe lower partofthe base member 24 is a transverse bar passage 26 inwhichthe endof a handbarmay be inserted to turnthe' base member 24whendesired. The handbar isnot shown. 7 Any suitable rod'will answerthe. purpose. The base portion124; ofthe jack has aspherical seat'27 fora ball28'that rises ment vertically of the jack by turning the engagedscrew threaded portions 25"'of "the base members i from the groundplate29. Thus there is auni- I versal' joint between the jack and theground, and any angular displacement of'the ground plateis' corrected bythe universaljjoint, and'the frameof the ladder, may be'arranged on alevel. This leveling .of the frar'nejisQassiSted by 'the adjust- 24- bythe hand bar mentioned; housing 19 is raisedor loweredby means of asmall gear 30 in the comp'ar trnent2 l; The gearis rotated byits shaft31, formed as shown in Fig. 6 forfthej at- I tachme'nt'of an ordinarycrank handle,, not shown.

, introduced topreventthe .contrary rotation of the-{jack shaft 31 whereit is desirable. It is 1 Any form .of'fpawl and *ratchet devices. forexample,'such as those illustrated in Fig. 9,1ma'y be held to be withinthe purview of this invention to runaj suitable setscrew through the endbearings 32 for the jack shaft'31 by, Wh Qh'the shaft and gear 30 maybeheld stationary, or released at. the will ofthe operator, 'f As bestillustrated inlFig. 3,; a post 33 is erected on the turntable 8 atapoint in rear of the oen'ter, and the post 33-has a" pu1 y 34 i h topone transverse shortshaft 35: Asjshown in Fig. 2 at the left near therim of the turntable ingthe drum or reel 4l'and cable42, which passesoverjpulley 34 on postf33; and fis attachedto a truss 43 erected on 'oneof the'ladder'sections; In Fig. 2 theca'ge'shown at the extremity of.the upper section of, the ladder is.rererred tohas a Near" one end'of 1the frame; as illustrated Fig. 2 is a tank 45, and between the; tank andthe turntable and upon the 'floor plate l6 which is supported upon beamssuch as the intermediate cross beams 5 is located a motor 4;?- beltconnected with a pump 48, and the pump is arranged to force fluidthrough the pipe line 49 from the tank 45 to thedrum 50. It will beunderstood that the piping 49 as shown in Fig. 2'extends first I to thepump '48, and thence below the center of the. turntable. The pipe linepasses upwardly from beneath the frame through the hollow bearing 7 o fthe turntable. The drum or hose reel 50 has wound thereon a hose 51 and.the hose is connected with the pipe line connection of the reel so thatfluid may be sent through the hose. Suitable valves may be introduced,and at the top of'the hollow bearing 7, as shown in Figs. 1 and '2, acylindrical rotative pipe joint 49a is'provided to permit the parts ofpipe line {19 above. the turntablefto make acomplete revolutiontherewith whilefinaintaining open passage Wlth thejpipe in hollowbearing 7; Itwill "be understood that thefpurnp'andmotor may, be used toserve compressedair jfor' the use of painters or sandblastjwallcleaners. The motor is not limitedto the operation of pump forfluid dise tribution'."

"As bestis'hownjin Figs. 1,2 and 8,'a drum'52 carried by the ladder 39is Wound by the cable 53 that passes over 'thesheaves 54 and is attachedgto'thepoint 53' of the'top section. The cable is passed first over thetop sheave of the lower sec ti'ongand jthenoearound the lower sheave ofthe next section so that when the cable'is drawn upon-the sections areextended 'as will be readily understood from Fig. 8. To retain thesections in extendedcondition, the drum shaft 550i drum 52 as bestsh'owninFigL; 9'has agear 56 engagmgaigear 5 thelatter being a ratchet gearand provided with the. pawl; 58. maybe held extended or released atwill.

bus, the sections Considering Figs. 8 and 11, it will be noted that ;thetop section of-theladder has'an'end plate or cap 59, andthrough theplate 59 there is'fpassedone trunnion 60"of the cage'support "hoop 61.The "trunnion is best illustrated in Fig. 15. To the trunnion 60iskeyed. a 'brake wheel 62 'h'aviingia brake band 63,.' one end of whichis pivotally secured by pin '64 to the end plate or cap 'ofi'thesection. A brake lever 65 is connected by the pivot pin 66. to the otherend 01 thebrake band, and the lever. l ias a pivot '67,

.on"aproj ection'68 'of the cap. The projection 68 is a pivoted piece orarm substantially of the 1 30 curved form illustrated in Fig. 111 andthepinQ64 connects it with the cap :or' end plate 59'. vAs the lever ispulled downwardly the band63 istight ened around the" wheel 62, and theend of the its band engaged by the-pivot .66 is. pressed against 1 theWheel; [When the brake iever is operated the support 1156 5 611 isheld'or. released. I Asillustrat d 11 Fi 13 the Su por en 1 pa s be.tween'rollers 70-and 7l on plfojecting members of the cageso, thatthecage asa whole may be rotated-about a vertical axis. It will furtherbe -=now understood 'thatrthere are two trunnions .such as 60 and thesecond trunnionlpasses piv- 'otally throughthe cap plate or head of-thefellow sidemember of the top section. In'other words,-?thef'two sidemembers of the top section o'ffthe' ladder. are eachprovided with capplates 59 as shown in Fig. '8', and the support'ho'op; 61 hastwotrunnions diametrically opposite each s'othenpivotally engagingthetwo cap plate 59. 1 50 The cage 44 swings on the ,trunnions aindrmayrotate on the s'upportho'op, 7 Considering Fig. 16,"it

rim turned up over the lowest ring73 of, the cage. It is upon this floorthat theworkman stands. His position, is always upright, asv the cageswings on the trunnions and assumes when the ladder is raised andextended aeposition-sub- 1o floationis clearly set forth in Fig. 18.

stantially as illustrated in Fig. 17'. I

In Fig. 18 is showna modified cage and supporting means which issometimes advantageous} In the figure, the top ends'ofthe sides oi theupper ladder section 3 9 areprovided-with a transverse shaft .74 upontheouter ends of which are grooved pulleys 75, and midway the ,shaft hasa pulley 76L Over pulleys '75 pass cables 77, which also pass throughthe ends 78 of the draw bar 79,. of a platform'cage, whichlis raisedand. lowered by the cable 80 passing over the middle pulley 76. Thecables 77 are guidecables, and they are kept taught by theweights 81, inorder that the cage maybe raised and lowered without excessive swinging.It is thought the modi- The operation of'this invention is as that ofextension ladders of similar construc tion. The ladder -may be extendedas desired by means of the'cable 53, andraised or lowered by the cable42 It is'customar'y in practice to support the upper portion of;theladder when not in 'use, inthe inclined position illustrated in Fig.2,by means of the vertical end frame 69; to clear-the tank 'and partsadjacent-and'to relieve the cable from constant'strain. The cage r 44swings into position with its axis vertical in response to the'weight ofthe workman, and the brake wheel and brake band with the hand brake"leverare used after adjustment to prevent-the cage from unduly swingingupon its trunnion' bearing support hoop; The ladder maybe raised to anyheight, and turned .into anyposition at will be noted th t a; metalfloor plate 72 has its peripheral edgefor' the same the side byis-located demands a broader ground base for the frame, the sliding barsmay be extended be- .yond the frame for any distance necessary, and

then adjusted by the jacks as set forth.

Having now described'thisj invention and "its use,Iclaim:-- i

1.1In an extensionladder, a supporting frame, in combination withaturntable carried by the for extending the ladder, means carried by thecontrolling the turntable The frame 7 i .may be, brought to a desiredlevel by means of the jacks, and if the altitude at which the cageturntable for raising theladder in any rotated position of theturntable, a hose reel vcarried by the turntable, and fluidservingconnections' passing upwardly through the centerxof revolution ofthe turntable whereby fluid under pressure, may be served to the saidhose reelduring a 7 complete revolution of the turntable.

2.-In a laddermechanism, a supporting mine," P i in combination with-aturntable, agear borne- 4 by the turntable and a stationarygear carriedbyl'the frame'in engagement with the gear first mentioned, a handwheel'and shaft carried by the-turntable foroperating s'aid ge'arwhereby a I fireman uponthe turntable may give samea complete revolutionin either direction, a ladder carried by-the turntable; a hose reelcarried by i the turntable, and fluid serving connections passingupwardly through the center of revolution of the turntable wherebyfluidunder'pressure may be Served t Said o eel during a co plete em fi 0f u ale.

r V P-JAIVIESHFQ'YMURPHY,

